Update to 3.5.2 and .net core 2.1

MediaBrowser.Controller/Net/SecurityException.cs

@@ -1,21 +0,0 @@
-using System;
-
-namespace MediaBrowser.Controller.Net
-{
-    public class SecurityException : Exception
-    {
-        public SecurityException(string message)
-            : base(message)
-        {
-
-        }
-
-        public SecurityExceptionType SecurityExceptionType { get; set; }
-    }
-
-    public enum SecurityExceptionType
-    {
-        Unauthenticated = 0,
-        ParentalControl = 1
-    }
-}